<?php
declare(strict_types=1);

require_once __DIR__ . '/_bootstrap.php';
require_once dirname(__DIR__, 3) . '/backend/JwtToken.php';
require_once dirname(__DIR__, 3) . '/backend/ApiAuth.php';
api_method('GET');

try {
    $database = Database::getInstance();
    $statement = $database->prepare(
        'SELECT setting_key, setting_value, revision FROM app_settings WHERE is_public = 1 ORDER BY setting_key'
    );
    $statement->execute();
    $result = $statement->get_result();
    $settings = [];
    $revision = 0;

    while ($row = $result->fetch_assoc()) {
        $decoded = json_decode($row['setting_value'], true);
        $settings[$row['setting_key']] = $decoded;
        $revision = max($revision, (int) $row['revision']);
    }

    header('Cache-Control: public, max-age=60, stale-while-revalidate=300');
    api_json(['revision' => $revision, 'settings' => $settings]);
} catch (Throwable $exception) {
    error_log('Public configuration unavailable: ' . $exception->getMessage());
    api_json(['error' => 'service_unavailable'], 503);
}